[GreenKeys] FCC substitutes bandwidth limit for baud rate limit on HF

[hwhall@aol.com]

 Right in the first paragraph it says:" rules regarding technical standardsapplicable to data communications that may be transmitted in the Amateur Radio Service."So, just data communications.
WayneWB4OGM 
    On Tuesday, November 14, 2023 at 11:02:03 PM MST, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:  
 
     Perhaps someone here understands this better than I do. Does the 
bandwidth limitation apply only to digital or data transmission or to 
all transmission, such as SSB and AM?  If it applies to those it would 
pretty much kill AM. I usually can make some sense of legal documents 
but this one has stymied me.

On 11/14/2023 11:53 AM, Harold Hallikainen via GreenKeys wrote:
> They are substituting a bandwidth limit of 2.8 kHz for the previous baud
> rate limit of 300 baud.
> 
> https://docs.fcc.gov/public/attachments/FCC-23-93A1.pdf
> 
> Looking at the new 97.307...
> 
> § 97.307 Emission standards.
> * * * * *
> (f) * * *
> (3) Only a RTTY or data emission using a specified digital code listed in
> § 97.309(a) may be transmitted. The authorized bandwidth is 2.8 kHz except
> in the 2200 m band and 630 m band. In the 2200 m band and the 630 m band
> the symbol rate must not exceed 300 bauds, or for frequency-shift
> keying, the frequency shift between mark and space must not exceed 1 kHz.
> 
> It looks like the 1 kHz shift limit is ONLY for the 2200 meter and 630
> meter bands. So, can we run 2 kHz shift to get around selective fading?
> 
> Further, the wording of that section appears to limit baud rate or shift,
> but not both for those bands. Since those bands are quite narrow (135.7 to
> 137.8 kHz and 472 kHz to 479 kHz), it's difficult to run very wide shift
> or  high baud rate.
> 
> Harold
> https://w6iwi.org
> 


-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
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